diff --git a/packages/react/index.fb.js b/packages/react/index.fb.js
index 7892f31dd4757..4764281481dbb 100644
--- a/packages/react/index.fb.js
+++ b/packages/react/index.fb.js
@@ -7,6 +7,8 @@
  * @flow
  */
 
+import {enableOwnerStacks} from 'shared/ReactFeatureFlags';
+import {captureOwnerStack as captureOwnerStackImpl} from './src/ReactClient';
 export {
   __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
   __COMPILER_RUNTIME,
@@ -68,3 +70,11 @@ export {useMemoCache as unstable_useMemoCache} from './src/ReactHooks';
 // export to match the name of the OSS function typically exported from
 // react/compiler-runtime
 export {useMemoCache as c} from './src/ReactHooks';
+
+// Only export captureOwnerStack in development.
+let captureOwnerStack: ?() => null | string;
+if (__DEV__ && enableOwnerStacks) {
+  captureOwnerStack = captureOwnerStackImpl;
+}
+
+export {captureOwnerStack};
diff --git a/packages/react/src/ReactServer.fb.js b/packages/react/src/ReactServer.fb.js
index d6702023e4741..fe6260a799a2c 100644
--- a/packages/react/src/ReactServer.fb.js
+++ b/packages/react/src/ReactServer.fb.js
@@ -10,6 +10,8 @@
 export {default as __SERVER_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE} from './ReactSharedInternalsServer';
 
 import {forEach, map, count, toArray, only} from './ReactChildren';
+import {enableOwnerStacks} from 'shared/ReactFeatureFlags';
+import {captureOwnerStack as captureOwnerStackImpl} from './ReactOwnerStack';
 import {
   REACT_FRAGMENT_TYPE,
   REACT_PROFILER_TYPE,
@@ -37,6 +39,12 @@ const Children = {
   only,
 };
 
+// Only export captureOwnerStack if the flag is on, to support feature detection.
+let captureOwnerStack: ?() => null | string;
+if (__DEV__ && enableOwnerStacks) {
+  captureOwnerStack = captureOwnerStackImpl;
+}
+
 export {
   Children,
   REACT_FRAGMENT_TYPE as Fragment,
@@ -57,4 +65,5 @@ export {
   useDebugValue,
   useMemo,
   version,
+  captureOwnerStack, // DEV-only
 };
diff --git a/packages/react/src/__tests__/ReactStrictMode-test.js b/packages/react/src/__tests__/ReactStrictMode-test.js
index 97fcc1ec8c4ce..db60674ba64bf 100644
--- a/packages/react/src/__tests__/ReactStrictMode-test.js
+++ b/packages/react/src/__tests__/ReactStrictMode-test.js
@@ -1028,40 +1028,67 @@ describe('context legacy', () => {
       root.render(<Root />);
     });
 
-    assertConsoleErrorDev([
-      'LegacyContextProvider uses the legacy childContextTypes API ' +
-        'which will soon be removed. Use React.createContext() instead. ' +
-        '(https://react.dev/link/legacy-context)' +
-        '\n    in LegacyContextProvider (at **)' +
-        '\n    in div (at **)' +
-        '\n    in Root (at **)',
-      'LegacyContextConsumer uses the legacy contextTypes API which ' +
-        'will soon be removed. Use React.createContext() with static ' +
-        'contextType instead. (https://react.dev/link/legacy-context)' +
-        '\n    in LegacyContextConsumer (at **)' +
-        '\n    in div (at **)' +
-        '\n    in LegacyContextProvider (at **)' +
-        '\n    in div (at **)' +
-        '\n    in Root (at **)',
-      'FunctionalLegacyContextConsumer uses the legacy contextTypes ' +
-        'API which will be removed soon. Use React.createContext() ' +
-        'with React.useContext() instead. (https://react.dev/link/legacy-context)' +
-        '\n    in FunctionalLegacyContextConsumer (at **)' +
-        '\n    in div (at **)' +
-        '\n    in LegacyContextProvider (at **)' +
-        '\n    in div (at **)' +
-        '\n    in Root (at **)',
-      'Legacy context API has been detected within a strict-mode tree.' +
-        '\n\nThe old API will be supported in all 16.x releases, but applications ' +
-        'using it should migrate to the new version.' +
-        '\n\nPlease update the following components: ' +
-        'FunctionalLegacyContextConsumer, LegacyContextConsumer, LegacyContextProvider' +
-        '\n\nLearn more about this warning here: ' +
-        'https://react.dev/link/legacy-context' +
-        '\n    in LegacyContextProvider (at **)' +
-        '\n    in div (at **)' +
-        '\n    in Root (at **)',
-    ]);
+    if (gate(flags => flags.enableOwnerStacks)) {
+      assertConsoleErrorDev([
+        'LegacyContextProvider uses the legacy childContextTypes API ' +
+          'which will soon be removed. Use React.createContext() instead. ' +
+          '(https://react.dev/link/legacy-context)' +
+          '\n    in Root (at **)',
+        'LegacyContextConsumer uses the legacy contextTypes API which ' +
+          'will soon be removed. Use React.createContext() with static ' +
+          'contextType instead. (https://react.dev/link/legacy-context)' +
+          '\n    in LegacyContextProvider (at **)' +
+          '\n    in Root (at **)',
+        'FunctionalLegacyContextConsumer uses the legacy contextTypes ' +
+          'API which will be removed soon. Use React.createContext() ' +
+          'with React.useContext() instead. (https://react.dev/link/legacy-context)' +
+          '\n    in LegacyContextProvider (at **)' +
+          '\n    in Root (at **)',
+        'Legacy context API has been detected within a strict-mode tree.' +
+          '\n\nThe old API will be supported in all 16.x releases, but applications ' +
+          'using it should migrate to the new version.' +
+          '\n\nPlease update the following components: ' +
+          'FunctionalLegacyContextConsumer, LegacyContextConsumer, LegacyContextProvider' +
+          '\n\nLearn more about this warning here: ' +
+          'https://react.dev/link/legacy-context' +
+          '\n    in Root (at **)',
+      ]);
+    } else {
+      assertConsoleErrorDev([
+        'LegacyContextProvider uses the legacy childContextTypes API ' +
+          'which will soon be removed. Use React.createContext() instead. ' +
+          '(https://react.dev/link/legacy-context)' +
+          '\n    in LegacyContextProvider (at **)' +
+          '\n    in div (at **)' +
+          '\n    in Root (at **)',
+        'LegacyContextConsumer uses the legacy contextTypes API which ' +
+          'will soon be removed. Use React.createContext() with static ' +
+          'contextType instead. (https://react.dev/link/legacy-context)' +
+          '\n    in LegacyContextConsumer (at **)' +
+          '\n    in div (at **)' +
+          '\n    in LegacyContextProvider (at **)' +
+          '\n    in div (at **)' +
+          '\n    in Root (at **)',
+        'FunctionalLegacyContextConsumer uses the legacy contextTypes ' +
+          'API which will be removed soon. Use React.createContext() ' +
+          'with React.useContext() instead. (https://react.dev/link/legacy-context)' +
+          '\n    in FunctionalLegacyContextConsumer (at **)' +
+          '\n    in div (at **)' +
+          '\n    in LegacyContextProvider (at **)' +
+          '\n    in div (at **)' +
+          '\n    in Root (at **)',
+        'Legacy context API has been detected within a strict-mode tree.' +
+          '\n\nThe old API will be supported in all 16.x releases, but applications ' +
+          'using it should migrate to the new version.' +
+          '\n\nPlease update the following components: ' +
+          'FunctionalLegacyContextConsumer, LegacyContextConsumer, LegacyContextProvider' +
+          '\n\nLearn more about this warning here: ' +
+          'https://react.dev/link/legacy-context' +
+          '\n    in LegacyContextProvider (at **)' +
+          '\n    in div (at **)' +
+          '\n    in Root (at **)',
+      ]);
+    }
 
     // Dedupe
     await act(() => {
diff --git a/packages/react/src/__tests__/createReactClassIntegration-test.js b/packages/react/src/__tests__/createReactClassIntegration-test.js
index 811d897e859e7..4aabc11b52e8d 100644
--- a/packages/react/src/__tests__/createReactClassIntegration-test.js
+++ b/packages/react/src/__tests__/createReactClassIntegration-test.js
@@ -338,7 +338,14 @@ describe('create-react-class-integration', () => {
       root.render(<Outer />);
     });
     assertConsoleErrorDev([
-      'Component uses the legacy childContextTypes API which will soon be removed. Use React.createContext() instead.',
+      gate(flags =>
+        flags.enableOwnerStacks
+          ? [
+              'Component uses the legacy childContextTypes API which will soon be removed. Use React.createContext() instead.',
+              {withoutStack: true},
+            ]
+          : 'Component uses the legacy childContextTypes API which will soon be removed. Use React.createContext() instead.',
+      ),
       'Component uses the legacy contextTypes API which will soon be removed. Use React.createContext() with static contextType instead.',
     ]);
     expect(container.firstChild.className).toBe('foo');
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js b/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js
index 832838313095c..fc9bed7cc056f 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js
@@ -26,3 +26,4 @@ export const passChildrenWhenCloningPersistedNodes = __VARIANT__;
 export const enableFabricCompleteRootInCommitPhase = __VARIANT__;
 export const enableSiblingPrerendering = __VARIANT__;
 export const enableUseResourceEffectHook = __VARIANT__;
+export const enableOwnerStacks = __VARIANT__;
diff --git a/packages/shared/forks/ReactFeatureFlags.native-fb.js b/packages/shared/forks/ReactFeatureFlags.native-fb.js
index defa7cd330d7f..58ae9c4fffe41 100644
--- a/packages/shared/forks/ReactFeatureFlags.native-fb.js
+++ b/packages/shared/forks/ReactFeatureFlags.native-fb.js
@@ -28,6 +28,7 @@ export const {
   enableUseResourceEffectHook,
   passChildrenWhenCloningPersistedNodes,
   enableSiblingPrerendering,
+  enableOwnerStacks,
 } = dynamicFlags;
 
 // The rest of the flags are static for better dead code elimination.
@@ -67,7 +68,6 @@ export const enableLegacyCache = false;
 export const enableLegacyFBSupport = false;
 export const enableLegacyHidden = false;
 export const enableNoCloningMemoCache = false;
-export const enableOwnerStacks = false;
 export const enablePostpone = false;
 export const enableProfilerCommitHooks = __PROFILE__;
 export const enableProfilerNestedUpdatePhase = __PROFILE__;
diff --git a/packages/shared/forks/ReactFeatureFlags.www-dynamic.js b/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
index db38e0e1fdcba..7c28c76fb1392 100644
--- a/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
+++ b/packages/shared/forks/ReactFeatureFlags.www-dynamic.js
@@ -27,6 +27,7 @@ export const enableRetryLaneExpiration = __VARIANT__;
 export const enableTransitionTracing = __VARIANT__;
 export const favorSafetyOverHydrationPerf = __VARIANT__;
 export const renameElementSymbol = __VARIANT__;
+export const enableOwnerStacks = __VARIANT__;
 export const retryLaneExpirationMs = 5000;
 export const syncLaneExpirationMs = 250;
 export const transitionLaneExpirationMs = 5000;
diff --git a/packages/shared/forks/ReactFeatureFlags.www.js b/packages/shared/forks/ReactFeatureFlags.www.js
index 8ddbf3dd7c519..da97bbc212876 100644
--- a/packages/shared/forks/ReactFeatureFlags.www.js
+++ b/packages/shared/forks/ReactFeatureFlags.www.js
@@ -37,6 +37,7 @@ export const {
   retryLaneExpirationMs,
   syncLaneExpirationMs,
   transitionLaneExpirationMs,
+  enableOwnerStacks,
 } = dynamicFeatureFlags;
 
 // On WWW, __EXPERIMENTAL__ is used for a new modern build.
@@ -121,7 +122,6 @@ export const useModernStrictMode = true;
 
 export const disableLegacyMode = true;
 
-export const enableOwnerStacks = false;
 export const enableShallowPropDiffing = false;
 
 // Flow magic to verify the exports of this file match the original version.